Smart Navigation Widgets is plugin with 4 widgets (and 1 bonus widget) ideal for bloggers or any other WordPress users with big archives that can be hard to navigate. Using this plugin, you can display AJAX powered archive widget that shows only small portion of archives to user, and allows him to navigate deeper only when he needs to.
Demo: http://bit.ly/1Nx8vrO
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http://bit.ly/1PtGTtE
http://bit.ly/1Nx8xAa